Please try the following. www.ofset.org http://www.edubuntu.org/ http://www.seul.org/edu/ http://schoolforge.net/ moodle.org/
actually, the list on the right side on the page : http://richtech.ca/seul/ is an extremely exhaustive one.
Btw, I did not get the question by the way when it comes to "which are readily available in india ".
Most of the softwares are readily available on the net. All you have to do is have a decent Net connection or challenge a Free software evangelist that such software does not exist for Open source and it will be available as a reply ;-P
Jokes apart, all you have to do is, ask a software evangelist with good network speed to download it. Most of them will be happy to arrange it somehow.
-- Laxminarayan Kamath Ammembal (+91) 9342287956 laxminarayan@deeproot.co.in www.geocities.com/kamathln